| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Gather, Malte Christian
University of Cologne
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2023Hyperspectral Confocal Imaging for High-Throughput Readout and Analysis of Bio-Integrated Laser Particles
- 2023High-density integration of ultrabright OLEDs on a miniaturized needle-shaped CMOS backplanecitations
- 2021Effective permittivity of co-evaporated metal-organic mixed filmscitations
- 2020Spectroscopic near-infrared photodetectors enabled by strong light-matter coupling in (6,5) single-walled carbon nanotubescitations
- 2020Improving the thermal stability of top-emitting organic light-emitting diodes by modification of the anode interfacecitations
- 2018Investigating the molecular orientation of Ir(ppy)3 and Ir(ppy)2(acac) emitter complexes by X-ray diffractioncitations
- 2018The role of metallic dopants in improving the thermal stability of the electron transport layer in organic light-emitting diodescitations
- 2016Orientation of OLED emitter molecules revealed by XRDcitations
- 2016Elastomer based electrically tunable, optical microcavitiescitations
- 2015Influence of cavity thickness and emitter orientation on the efficiency roll-off of phosphorescent organic light-emitting diodescitations
- 2015Microglia mechanicscitations
- 2014Influence of cavity thickness and emitter orientation on the efficiency roll-off of phosphorescent organic light-emitting diodescitations
- 2009Improving the lifetime of white polymeric organic light-emitting diodescitations
Places of action
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article
The role of metallic dopants in improving the thermal stability of the electron transport layer in organic light-emitting diodes
Abstract
4,7‐Diphenyl‐1,10‐phenanthroline (BPhen) is widely used to create the electron transport layer (ETL) in organic light‐emitting diodes (OLEDs) because of its high electron mobility and good compatibility with alkali metal n‐dopants. However, the morphology of these ETLs is easily altered by heating due to the relatively low glass transition temperature (<i>T</i><sub>g</sub>) of BPhen and this change often reduces the performance of OLEDs. Here, an enhancement in the thermal stability of OLEDs when doping their BPhen‐based ETLs with cesium (Cs) is reported. To investigate the role of the Cs dopant in the BPhen matrix, the crystallization features of Cs‐doped BPhen films with different doping concentrations are examined. Next, the electrical and optical properties of blue fluorescent and red phosphorescent OLEDs containing Cs‐doped BPhen ETLs are characterized after annealing the OLEDs at temperatures up to 100 °C. Cs plays a critical role in inhibiting the undesired crystallization of BPhen films, which enhances the thermal stability of OLEDs beyond the <i>T</i><sub>g</sub> of neat BPhen. Finally, highly stable BPhen‐based OLEDs encapsulated via atomic layer deposition at 80 °C are demonstrated. This work may lead to a new strategy for enhancing the intrinsic thermal durability of organic devices and their compatibility with thermally demanding processes.